Method of building cord tires



C. F. OFENS'E'NI).

METHOD 0F BUILDING CRD TIRES.

APPLICATION -FILED' MAY 6, I92I. lfi l Patemedug. 23,

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,IWI YQ Allg. 23, 3 SHEETS-SHE Patented C. F. OFENSEND.

METHOD 0F BUILDING CORD TIRES APPLICATION FILED Mms, 192x.

IIIII MIIImIIIwH I D ATTGRNEY.

. y C. F. OFENSIEIIID."

METHOD 0F BUILDING CORD TIRES.

' APPLICATION FILED IIIAY 6,1921.

Patented Aug. 1921.

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a III firent oFFlcE.

CHLSE F. FENSEND, 0F AKRON, HI, ASSIGNOR TO THE MILLER RUBBER COM- fallY, OF A KRN, OHIO, A GORIORATION 0F OHIO.

EJIETHD 0F BUILDING CORD TIRES.

inserat.

Specification of Letters Patent.

appncanoa inea nay e, i921. serial No. 462,413.

To all 'whom it may concern Be it known that I, CHASE F. rnNsnNn, a citizen oit the United Sta-tes, and resident of Akron, hio, have invent-ed certain neur and useful Improvements in Methods oi' Building Cord Tires, of which the following isa specification.

My present invention relates to improvements in the method ot manufacturing cord tires.

Heretofore, in the manufacture of'sucli tires, it has been customary to apply the tire forming material, including the cord structure or cord fabric, to or build it upon a metal core, and, after it is properly formed, to remove the carcass 'from the coro. An expansible air bag of ring forni is then inserted in the`carcass, which latter is placed in the mold and the bag inflated to stretch the cord fabric and cause the carcass to snugl y .tit the mold.

This method of procedure has many 'objections,'including the extra Work required in removing the core from tlie unvulcanized' tire body, and the insertion or' the air bag therein, which it is 'the object or' the present invention to avoid.

The invention includes the novel method as hereinafter described and particularly defined by the appended claims.

In the drawing"- Figure il is a side elevation of the core.

Fig. 2 is a section on line 2--2 oi Fig. l.

Fig. 3 is an enlarged transverse section through one side ci the core Wit-li the tire thereon in position wit-hin a niold before Stretching the tire, and v Fig. d .is a similar View With the core bag expanded to stretch the tire.

Figs. 5 to 8 inclusive are detail views of modifications.

For carrying out my improved method, I provide an elastic core upon which the tire is built, which core comprises a ring shaped member l having relatively narrow inwardly extending web shaped on vits opposite faces to rec ,i e the jiertions il of the mold sections The ring ineinbei il has outwardly daring walls l shaped te give the proper formation to lthe inner faces of the edge portions of the tire, which tire is indicated by the numeral 3.

The ring l is provided with peripl'ieral seat, preferably of substantially the shape shown, including a central. concave portion l.X merging into the convex portions l" upon which an endless elastic iiifiatable tube .Je is .mounted This is provided with an iniating tube 4 passing through an opening in the ring and adapted to he detachably connected to any suitable source of supply of iuid (such as air) under pressure.

rIhe ring, web or iiange is provided at its inner edge with a groove lb'designed to be engaged by the ends of the arnis ot' the custernary tire building chuck in the manner Well understood by those skilled in the art.

Asthe majority of cord tires manufactured are of the inexteiisible edge or quick detachable type embodying iiiextensible bead rings in their edges, I make the ring l in the form of a sectional ring, or in other Words, divide such ring into sections on lines indicated at 1c inv Fig. 1, and secure such ring sections in abutting position by suitable means engaging the inner portion ot' the web which lies within the inner face of the mold, as shown in Figs. 3 and 4.

Such means may conveniently take the forni of clamping rings 5 held against opposite faces ot' such Web by bolts 6.

'In proceeding to carry out my improved method, I expand the bag, mounted on the ring, as shown in Figs. l and 2, to the proper to conform to the size of tire to be built thereon, using a teinplet to' determine when the core bag has been expanded to the proper degree. The core being mounted on a suitable chuck, I proceed to apply the tire forming iiiaterial thereto in the usual or any approved manner, and When the material is all assembled thereon, I place the core with the tire thereon ina mold, as indicated in Fig. 3. After the mold is closed, the core bag is iniated to stretch the cord fabric and expand the tire from the position shown in Fig. 3 to that shown in Fig. 4, and thereafter the pressure is maintained during the vulcanization of the tire by heat applied to the mold in the customary' manner. After vulcanization is complete the mold is opened, the core removed. troni the tire and a fresh tire built thereon..

To obviate any separation oi the bag from tube, or that portion adjacent the core ring l, with reinforcing` layers of fabric, as indicated at 4".' as Shown in Fig. 5, and may provide a further reinforcement in the shape of an embedded wire bead 4C, as shown in Fig. 6.

' Another n'iani'ier shown in Fig. bagr adjacent the structure,` to an inflated elastic core, placing the corewith the tire material carried thereby in a closed mold, subjecting the core to increased internal pressure to stretch the tire material, and subjecting it to vulcanizing heat while so expanded.

2. The hereindescribed method `of mann-` facturing cord tires which consists in applying thetire .materiah including the cord structuie, to an inflated elastick core, placing the core with the tire material carried thereby 1n a closed mold, having an internal di-.

ameter exceeding the external diameter of the tire, subjecting the core to increased internal pressure to stretchthe tire material and cause it to expand to fill the mold cavity, and subjecting it to vulcanizing heat While so expanded.

In testimony whereof, I afix my signature.

CHASE i?. OFEBTSEUATD.` 

